Leptorhaphis lucida Körb.

Parerga Lichenol., 4: 384, 1863
Synonyms: Arthopyrenia lucida (Körb.) Müll. Arg.; Leptorhaphis tremulae Körb. var. lucida (Körb.) Keissl.
Description: Thallus crustose, endo- to very thinly episubstratic, whitish-grey, smooth, continuous, not well delimited, consisting of colourless to pale brown, smooth, thin-walled c. 2-3 μm thick hyphae constricted at septa, more or less associated with trentepohlioid algae. Perithecia black, shiny, circular, not surrounded by a basal fringe, scattered singly, 0.13-0.5 mm across, at first immersed in the bark but soon becoming superficial, hemispherical, the ostiole centrally located in a small depression. Involucrellum dark brown to almost black, c. 25-35 μm thick, not extending beyond the perithecium in a basal fringe, consisting of dark brown, thin-walled, smooth, c. 3.5 μm thick hyphae intermixed with host tissue, forming a pseudoparenchymatous tissue; exciple colourless to pale brown, intergrading with the involucrellum and slightly thinner, also forming a pseudoparenchymatous tissue; pseudoparaphyses c. 2-2.5 μm thick; hymenial gel I-. Asci 8-spored, cylindrical-clavate, bi- and fissitunicate,, with a broad, truncate apical beak, and biseriately arranged spores. Ascospores 1-septate, hyaline, fusiform, slightly curved, 45-65(-70) x 2.5-4 μm. Photobiont absent or trentepohlioid. Spot tests: K-, C- KC-, P-. Chemistry: without lichen substances.
Note: on various species of Populus; doubtflully lichenized. Widespread in northern and Central Europe, and also reported from Austria (Carinthia), not far from the Italian border; to be looked for in Italy.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual

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Predictive model

New York Botanical Garden (NY) – CC BY-SA NC – Source: http://sweetgum.nybg.org/images3/3799/172/04251267.jpg